Yes. In 2.0.5.1 (available through the SyncUpdate notifier), there was a fix for one such problem.
You also should try setting
Dim engine As GridFormulaEngine = CType(gridControl1.CellModels("FormulaCell"), GridFormulaCellModel).Engine
engine.UsesVirtualDataSource = True
Setting this property may clear up the problem.
Can you see the problem in one of our samples, or can you attach a sample showing the problem? That way, we can try it here and make sure it has been handled.

There is one other open problem using multisheeted grids that will be handled in the next update.
In some situations, if you have formulas in one sheet that do not use explicit sheet references (ie. = A1 - B1 instead of = sheet1!A1 - sheet1!B1), then the values are being pulled not from the local sheet as they should be, but instead are being pulled from some other sheet. Until we get an update out with this fixed, you can avoid the problem by including sheet references on all your cell references.

Is the fix in V2.0.5.1 related to the fact that cell content is only updated when cells become visible, but dependent cells may be visible prior to the dependees? If so, how do I get hold of the latest version with the fix? I am part of a developer group evaluating the Grid for a large ERP system and cross-sheet cell references is a must. We have an earlier release of V2.0 and have modified the Grid sourcecode somewhat to fit a slightly more flexible cell renderer model. Do our license key get access to the Grid source for V2.0.5.1?

If you log into Direct Trac, you will able to download any updates that are available to you. If you have questions about whether you are licensed for a particular version, you can email salessupport@syncfusion.com, and they should be able to provide you with that information.

2.0.5.1 should have created its own folder under Syncfusion\Essential Suite with its source provided your unlock key is valid for the source code version.
Syncfusion\Essential Suite\2.0.5.1\Grid\Src
It will not overwrite the 2.0.5.0 folder.

Yes, I made it work now. Thanks a lot. All honors to the Syncfusion customer support. That alone is reason enough to choose your products. Please publish the ''must use full adressing'' bug for cell refrerences as your Grid is now the ONLY grid supporting cross-sheet formulas correctly. El Tabelle has cross-sheet support too, but they have a bug preventing any culture with non-period decimal separator to work.